Threat Intelligence / CVE / CVE-2026-9115

CVE-2026-9115 — Google Chrome

CVSS v3.1 4.3 (MEDIUM) · EPSS 0.0% (higher than 8.2% of all scored CVEs) · Priority 2.5/10 · Published 2026-05-20

As of 2026-05-20, CVE-2026-9115 is a MEDIUM-severity vulnerability in Google Chrome, CVSS v3.1 4.3, EPSS 0.0% (8.2th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-9115, most recently “Google Chrome Stable 148.0.7778.178/179 — CVE-2026-9111 WebRTC Use-After-Free RCE & CVE-2026-9110 UI Inappropriate Implementation (16 CVEs Patched)”.

Last updated: 2026-05-20

What is CVE-2026-9115?

Insufficient policy enforcement in Service Worker in Google Chrome on prior to 148.0.7778.179 allowed a remote attacker to bypass same origin policy via a crafted HTML page. (Chromium security severity: High)

The record classifies CVE-2026-9115 under weakness class CWE-693. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first. 4 affected-product entries are recorded, across 4 vendors, listed below. The identifier was first published 115 days ago.

Severity and exploitation probability

CVSS v3.1 base score: 4.3 — MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
EPSS (FIRST): 0.0% probability of exploitation in the next 30 days, higher than 8.2% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 2.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2026-05-20

Is CVE-2026-9115 being exploited?

It currently carries a trending score of 8 in the Threadlinqs vulnerability feed.

Affected products and versions

Google: Chrome
Apple: Macos
Linux: Kernel
Microsoft: Windows

How to fix CVE-2026-9115

Vendor advisory: https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0841193308.html. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-9115

1 tracked threat in the Threadlinqs corpus references CVE-2026-9115, either in the campaign’s CVE list or as an indicator on the campaign record.

Google Chrome Stable 148.0.7778.178/179 — CVE-2026-9111 WebRTC Use-After-Free RCE & CVE-2026-9110 UI Inappropriate Implementation (16 CVEs Patched) — CRITICAL · 2026-05-21

Sources

Seeded from cveorg and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2026-9115 are available via the Threadlinqs MCP server (Purple tier). View plans →

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